feat: Add ValuePercent option to LABEL TYPE for Pie and Funnel charts

[kainchow]

SUMMARY

Add ValuePercent option to LABEL TYPE for pie and funnel charts

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

When the modification is complete, you can create a new Pie or Funnel chart in Superset, and select 'Value and Percentage' for the LABEL TYPE in CUSTOMIZE to validate.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[github-actions]

Congrats on making your first PR and thank you for contributing to Superset! 🎉 ❤️

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[john-bodley]

Thanks @kainchow for your PR. Given this is your first PR, I've kicked off the CI checks. Assuming they pass, I'll then merge your change.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6f6c37e) 69.14% compared to head (1aa0efa) 69.14%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
.../plugin-chart-echarts/src/Funnel/transformProps.ts	0.00%	1 Missing ⚠️
...ins/plugin-chart-echarts/src/Pie/transformProps.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #26407      +/-   ##
==========================================
- Coverage   69.14%   69.14%   -0.01%     
==========================================
  Files        1946     1946              
  Lines       75990    75992       +2     
  Branches     8479     8479              
==========================================
  Hits        52544    52544              
- Misses      21267    21269       +2     
  Partials     2179     2179              

Flag	Coverage Δ
javascript	56.45% <0.00%> (-0.01%)	⬇️

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